LMX2331LSLBX datasheet(3/23 Pages) NSC

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Pin Descriptions

Pin No.

LMX233XLSLD

20-pin Thin

CSP Package

Pin No.

LMX233XLSLB

24-pin CSP

Package

Pin No.

LMX233XLTM

20-pin TSSOP

Package

Name

I/O

Description

CC1

—

Power supply voltage input for RF analog and RF digital circuits.

Input may range from 2.7V to 5.5V. V

CC1 must equal VCC2.

Bypass capacitors should be placed as close as possible to this

pin and be connected directly to the ground plane.

122

—

Power Supply for RF charge pump. Must be

≥ V

CC.

233

o RF

Internal charge pump output. For connection to a loop filter for

driving the input of an external VCO.

GND

—

Ground for RF digital circuitry.

455

IN RF

RF prescaler input. Small signal input from the VCO.

566

IN RF

RF prescaler complementary input. A bypass capacitor should

be placed as close as possible to this pin and be connected

directly to the ground plane. Capacitor is optional with some loss

of sensitivity.

GND

—

Ground for RF analog circuitry.

788

OSC

Oscillator input. The input has a V

CC/2 input threshold and can

be driven from an external CMOS or TTL logic gate.

GND

—

Ground for IF digital, MICROWIRE™,F

oLD, and oscillator

circuits.

911

oLD

Multiplexed output of the RF/IF programmable or reference

dividers, RF/IF lock detect signals and Fastlock mode. CMOS

output

(see Programmable Modes).

Clock

High impedance CMOS Clock input. Data for the various

counters is clocked in on the rising edge, into the 22-bit shift

Data

Binary serial data input. Data entered MSB first. The last two bits

are the control bits. High impedance CMOS input.

Load enable high impedance CMOS input. When LE goes HIGH,

data stored in the shift registers is loaded into one of the 4

appropriate latches (control bit dependent).

GND

—

Ground for IF analog circuitry.

IN IF

IF prescaler complementary input. A bypass capacitor should be

placed as close as possible to this pin and be connected directly

to the ground plane. Capacitor is optional with some loss of

sensitivity.

IN RF

IF prescaler input. Small signal input from the VCO.

GND

—

Ground for IF digital, MICROWIRE, F

oLD, and oscillator circuits.

o IF

IF charge pump output. For connection to a loop filter for driving

the input of an external VCO.

—

Power Supply for IF charge pump. Must be

≥ V

CC.

CC2

—

Power supply voltage input for IF analog, IF digital,

MICROWIRE, F

oLD, and oscillator circuits. Input may range from

2.7V to 5.5V. V

CC2 must equal VCC1. Bypass capacitors should

be placed as close as possible to this pin and be connected

directly to the ground plane.

1, 9, 13, 21

—

No connect.

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